Re: Question about tunes on the 6.7
About "footprints"... I talked to the senior diesel tech at one of the local dealerships, he said that the computer didn't record if the tune had been changed he said that the only thing that could be checked was the memory, and that it would have an echo of what was in there. But he did say that just as people disconnect their batteries to get rid of a check engine light, which in turn makes it impossible for the dealership to know what happened, the same could be done for the new ECM program. So long story short according to the tech if you disconnect the battery for a little bit, no more "footprint"!